Hi all.

I have noticed that in the case when we try to clear two bits through a
small constant,
and ZBS is enabled then GCC split it into two "andi" instructions.
For example for the following C code:
  int foo(int a) {
    return a & ~ 0x101;
  }

GCC generates the following:
  foo:
     andi a0,a0,-2
     andi a0,a0,-257
     ret

but should be this one:
  foo:
     andi a0,a0,-258
     ret


This patch solves the mentioned issue.


-- 
With the best regards
Jivan Hakobyan